Table 1

Descriptive statistics of the 3287 men according to intelligence test score: the Copenhagen Perinatal Cohort 1959–1961, with follow-up until 2015, Denmark

Intelligence test scoreP value*
<90
(n=800)
90–110
(n=1586)
>110
(n=901)
Psychiatric disorders, n (%)†
 Yes227 (28.4)269 (17.0)96 (10.7)<0.001
 No573 (71.6)1317 (83.0)805 (89.4)
Parental alcohol use disorders, n (%)
 Yes108 (15.7)151 (10.6)46 (5.6)<0.001
 No582 (84.4)1270 (89.4)771 (94.4)
Parental psychiatric disorders, n (%)†
 Yes217 (31.5)382 (26.9)166 (20.3)<0.001
 No473 (68.6)1039 (73.1)651 (79.7)
Maternal smoking during pregnancy, n (%)
 Yes462 (59.5)795 (51.5)371 (41.9)<0.001
 No314 (40.5)749 (48.5)514 (58.1)
Birth weight (grams), mean (SD)3179 (660.7)3275 (622.7)3373 (605.1)<0.001
Maternal age at birth (years), mean (SD)25.3 (6.70)25.4 (6.33)27.5 (6.37)<0.001
Parity, first pregnancy, n (%)
 Yes366 (45.8)835 (52.7)468 (52.1)0.004
 No433 (54.2)749 (47.3)430 (47.9)
Childhood socioeconomic position, mean (SD)‡3.1 (1.44)3.9 (1.69)5.1 (1.86)<0.001
  • *P value for χ2 tests or ANOVA.

  • †The variable included registration of psychiatric disorders other than alcohol use disorders.

  • ‡Linear component (1–8 score with higher points indicating higher childhood socioeconomic position).

  • ANOVA, analysis of variance.